Detecting a Break in Beam - Electronic Circuits Projects Diagrams Free

Omar.M · 28th December 2006, 03:57 PM

Hello,
I want to make a cool, entrance light for my room. I am thinking of using an Infrared LED emitter, and a phototransistor. I want to detect if the beam is broken, and turn on the LEDs in a pattern.

I am thinking of using a 16F628A, 16F630 or 16F688 with BASIC. I have no idea how to do this, any help would be appreciated.

Thanks,
Omar

donniedj · 28th December 2006, 05:56 PM

Active HIGH Logic: LOW-->HIGH
====================
#DEFINE IR_RX PORTB, 1
MOVLW B'00000010'
MOVWF TRISB

MAIN:
BTFSS IR_RX
GOTO $ - 1

DO_PATTERNS:
...
...
...

GOTO MAIN
END_MAIN:

Active LOW Logic: HIGH-->LOW
====================
#DEFINE IR_RX PORTB, 1
MOVLW B'00000010'
MOVWF TRISB

MAIN:
BTFSC IR_RX
GOTO $ - 1

DO_PATTERNS:
...
...
...

GOTO MAIN
END_MAIN:

Active HIGH + Debounce Filter Logic: LOW-->HIG(SUPRESS)->LOW-->HIGH
====================
#DEFINE IR_RX PORTB, 1
MOVLW B'00000010'
MOVWF TRISB

MAIN:
BTFSS IR_RX
CALL X_MILLISEC_DELAY
BTFSS IR_RX
GOTO $ - 3

DO_PATTERNS:
...
...
...

GOTO MAIN
END_MAIN:

Pulse HIGH + Debounce Filter Logic: LOW-->HIGH->LOW
====================
#DEFINE IR_RX PORTB, 1
MOVLW B'00000010'
MOVWF TRISB

MAIN:
BTFSS IR_RX
CALL X_MILLISEC_DELAY
BTFSS IR_RX
GOTO $ - 3
BTFSC IR_RX
GOTO $ - 1

DO_PATTERNS:
...
...
...

GOTO MAIN
END_MAIN:

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar
Title	Starter	Forum	Replies	Latest
Building IR BEAM Break alarm system	damenace	Electronic Projects Design/Ideas/Reviews	4	28th April 2009 08:30 PM
infared break beam detector from forrest mims green book	maverick8888	Electronic Projects Design/Ideas/Reviews	14	30th July 2004 08:34 AM
Does this work? Laser break beam sensor and delay timer	RuaRi	Electronic Projects Design/Ideas/Reviews	5	6th May 2004 05:40 PM
IR Beam Break Circuit	schapman43	General Electronics Chat	2	7th February 2004 04:38 AM
HELP: Break Beam Switch using IR LED/rec (long)	funkmasterta	Electronic Projects Design/Ideas/Reviews	3	17th April 2003 04:03 AM

28th December 2006, 03:57 PM	#1
Omar.M	Detecting a Break in Beam Hello, I want to make a cool, entrance light for my room. I am thinking of using an Infrared LED emitter, and a phototransistor. I want to detect if the beam is broken, and turn on the LEDs in a pattern. I am thinking of using a 16F628A, 16F630 or 16F688 with BASIC. I have no idea how to do this, any help would be appreciated. Thanks, Omar

28th December 2006, 05:56 PM	#2
donniedj	Active HIGH Logic: LOW-->HIGH ==================== #DEFINE IR_RX PORTB, 1 MOVLW B'00000010' MOVWF TRISB MAIN: BTFSS IR_RX GOTO $ - 1 DO_PATTERNS: ... ... ... GOTO MAIN END_MAIN: Active LOW Logic: HIGH-->LOW ==================== #DEFINE IR_RX PORTB, 1 MOVLW B'00000010' MOVWF TRISB MAIN: BTFSC IR_RX GOTO $ - 1 DO_PATTERNS: ... ... ... GOTO MAIN END_MAIN: Active HIGH + Debounce Filter Logic: LOW-->HIG(SUPRESS)->LOW-->HIGH ==================== #DEFINE IR_RX PORTB, 1 MOVLW B'00000010' MOVWF TRISB MAIN: BTFSS IR_RX CALL X_MILLISEC_DELAY BTFSS IR_RX GOTO $ - 3 DO_PATTERNS: ... ... ... GOTO MAIN END_MAIN: Pulse HIGH + Debounce Filter Logic: LOW-->HIGH->LOW ==================== #DEFINE IR_RX PORTB, 1 MOVLW B'00000010' MOVWF TRISB MAIN: BTFSS IR_RX CALL X_MILLISEC_DELAY BTFSS IR_RX GOTO $ - 3 BTFSC IR_RX GOTO $ - 1 DO_PATTERNS: ... ... ... GOTO MAIN END_MAIN: